如何在 textview 上处理 + 和 - 我试过这种方式,但减号不起作用。每当我得到增加的数量时减号按钮都不起作用
public class HomeFragment extends Fragment {
Button btnShirtPlus,btnShirtMinus;
TextView text_quantity;
Integer incrementValue;
String counterDec;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home,container,false);
return rootView;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
btnShirtMinus = (Button)view.findViewById(R.id.btnMinusShirt);
btnShirtPlus = (Button)view.findViewById(R.id.btnPlusShirt);
text_quantity = (TextView)view.findViewById(R.id.txtCounterShirt);
btnShirtMinus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
counterDec = text_quantity.getText().toString();
incrementValue = Integer.parseInt(counterDec);
//counter -- ;
text_quantity.setText(String.valueOf(incrementValue));
Toast.makeText(getContext(), "Minus hit", Toast.LENGTH_SHORT).show();
}
});
btnShirtPlus.setOnClickListener(new View.OnClickListener() {
int counter = 0;
@Override
public void onClick(View v) {
// counter ++;
text_quantity.setText(String.valueOf(counter++));
Toast.makeText(getContext(), "Plus hit" + counter, Toast.LENGTH_SHORT).show();
}
});
}
}
下图显示了单击加号后发生的情况
最佳答案
你可以这样做:
对于添加按钮 -
btnShirtPlus.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
int value = Integer.parseInt(text_quantity.getText()
.toString().trim());
value++;
if (value >= 1) {
btnShirtMinus.setEnabled(true);
}
text_quantity.setText(String.valueOf(value));
}
});
对于删除按钮 -
btnShirtMinus.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
int value = Integer.parseInt(text_quantity.getText()
.toString().trim());
--value;
if (value == 0) {
btnShirtMinus.setEnabled(false);
}
text_quantity.setText(String.valueOf(value));
}
});
关于android - 在 TextView 中处理计数器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37024617/